Hi
I'm going to be upgrading my home network to 802.11n so I'm looking
for a good USB stick and/or ExpressCard that will also be good for
security work. I was looking at the Ubiquity SR71-X but that is a
little out of my price range at the moment.

We have PCI DSS Requirement:
"11.1 Test for the presence of wireless access points by using a wireless
analyzer at least quarterly or deploying a wireless IDS/IPS to
identify all wireless devices in use."

Ok, we can do this going through all CDEs and scan the air with e.g. Kismet.
Then